Dynamic-loading Paddy Soil Rheological Parameters Of Development Of Measuring Instrument

In order to study the influence of mechanical properties of wet and soft soils on the vehicle performances, and to provide the scientific basis for the design and selection of vehicles and other machines working on wet and soft soils, the four element Burgers rheological model are used to express the sinkage梥tress?-time relationship of Paddy Soils, and the sinkage梩ime equation of the soil surface under dynamic loading are theologically developed by means of transforming the dynamic loading to a step function F of time approximately, i.e: AP AP fx(t?j?)r) AP. = fl*Z[ ?+ ~?(1梕 ~k ~? ~ EM 11K Based upon the virtual theory the approach and instrument are developed to measure the paddy soil rheological parameters under dynamic loading. The hardware part of the instrument consists of a airproof raster displacement sensor JGX-2, stress sensor BK-2F and the data gathering card PCL-8 1 8L. The software part is developed with the language of VC?6.O,it comprises the data gathering driving module, the data gathering module, the data storage module, the calculation module and the data display module. Experiments are carried out under both static loading conditions and dynamic loading conditions, the results show that measured rheological parameters under different loading conditions are nearly same. So it can be concluded that the developed approach and instrument are feasible to measure the rheological parameters of paddy soils under dynamic loading.